Exercise device for use in water



FIG. 1 is a front and side perspective view of an exercise device for use in water showing my new design;

FIG. 2 is a rear and side perspective view of the exercise device of FIG. 1, shown in condition of use;

FIG. 3 is a side elevational view of the exercise device of FIG. 1, shown in condition of use; and,

FIG. 4 is a front elevational view of the exercise device of FIG. 1.

The broken lines illustrate environmental structure which forms no part of the claimed design. 

The ornamental design for an exercise device for use in water, as shown and described. 